Chui's counterpoint » Python

Printing the current running stack in Python

Chui — Thu, 23 Jul 2009 23:30:37 +0000

The traceback module has utility functions for printing the currently running stack, not just tracebacks.

import traceback
import logging

# somewhere in your buggy code
logging.log(1, "".join(traceback.format_stack())

unable to remap C:\cygwin\bin\tk84.dll to same address as parent

Chui — Sat, 25 Apr 2009 11:00:33 +0000

I was checking out Tauber’s Pinax, and came across VirtualEnv for the first time. Those are two cool projects.

However, building PIL on Cygwin Python 2.5 yields the following error message:

unable to remap C:\cygwin\bin\tk84.dll to same address as parent

Thanks to the power of Google, DataHammer has already found a resolution

C:\>cd \cygwin\bin
C:\cygwin\bin>ash
$ ./rebase -b 0x1000000000 tk84.dll

Python Grep

Chui — Wed, 28 Jan 2009 04:46:12 +0000

From ZazzyBob

Occasionally I have to wade through log files on sites running Windows, since our program is python based, it’s useful to be able to have these tools on hand without downloading exes. I’m hosting a copy here just in case it gets lost in the interweb.

#!/usr/bin/python
#< PYTHON - simple grep through a file - supports regex
# Usage: grep.py "pattern" file
# Written to test my fledgling python knowledge!

import sys
import re
arguments = sys.argv

def print_usage():
    print "USAGE:"
    print "grep.py \"pattern\" filename"

if len(arguments) != 3:
    print_usage()
    sys.exit(1)

searchterm = arguments[1]
file = arguments[2]

print "Searching for %s in %s" % ( searchterm, file )

try:
  fileToSearch = open( file, 'r' )
except IOError:
  print "No such file"
  sys.exit(2)

# Well, we've got this far - the file must exist!
data = fileToSearch.read()
data = data.split('\n')

patternprog = re.compile( searchterm )

for line in data:
  a_match = patternprog.search( line )
  if ( a_match ):
     print line

fileToSearch.close()
sys.exit( 0 )

Cygwin Python and sqlite3

Chui — Mon, 08 Sep 2008 01:57:33 +0000

Apparently, cygwin’s distribution of Python 2.5.1 doesn’t come with sqlite3. This is a pity for those who would like to work with Django using cygwin Python.

Building _sqlite3.dll on cygwin is not too difficult. If you are in a hurry, heres the download _sqlite3.dll.

Prerequisites

/bin/cygsqlite3-0.dll
/bin/libpython2.5.dll
/usr/include/sqlite3.h
/usr/include/python2.5/Python.h [et.c]

tar jxf Python-2.5.2.tar.bz2 Python-2.5.2/Modules/_sqlite/
cd Python-2.5.2/Modules/_sqlite/
gcc -shared -o _sqlite3.dll -I /usr/include/python2.5 -L /bin -lpython2.5 -lsqlite3-0 -D'MODULE_NAME="_sqlite3"' *.c
cp _sqlite3.dll /usr/lib/python2.5/lib-dynload/

download

_sqlite3.dll

Update 10 Sept 2008

Download link fixed. (Thanks Steve)